The Near
Infrared Coupler splits light at any selected wavelength from 700nm to
1150nm. Designed for applications in fibre laser, sensor and avionics
applications, the coupler utilizes G&H’s low loss fused fibre
technology. No light leaves the fibre and therefore no alignment is
required; and there are no unwanted reflections. Furthermore the output
fibre pigtails may be directly integrated into beam delivery systems.
For components and modules which combine different wavelengths within
the near infrared

region
please refer to the datasheet ‘Near Infrared WDM’.

Key
Features:

700 to
1150nm operation

Any
coupling ratio available

All fibre –
no alignment required

No unwanted
reflections

Low light
loss

High power
handling

Applications:

Fibre
lasers

Sensors

Avionics

Biomedical
equipment

Research

Optical Specifications

Coupling

Ratio (%)3

Grade

Available

Wavelength(s)

Available Housing Option

Signal Path Insertion Loss (dB)1,2

Tap Path Insertion

Loss (dB)1,2

1

A

700 to 1150nm

3,4,5,6

0.15

24.9

1

B

700 to 1150nm

3,4,5,6

0.20

25.3

5

A

700 to 1150nm

3,4,5,6

0.40

15.9

5

B

700 to 1150nm

3,4,5,6

0.50

16.2

10

A

700 to 1150nm

3,4,5,6

0.9

12.2

10

B

700 to 1150nm

3,4,5,6

1.1

12.4

20

A

700 to 1150nm

3,4,5,6

1.5

8.4

20

B

700 to 1150nm

3,4,5,6

1.7

8.6

30

A

700 to 1150nm

3,4,5,6

2.2

6.4

30

B

700 to 1150nm

3,4,5,6

2.4

6.4

40

A

700 to 1150nm

3,4,5,6

3.0

4.9

40

B

700 to 1150nm

3,4,5,6

3.2

5.1

50

A

700 to 1150nm

3,4,5,6

3.8

3.8

50

B

700 to 1150nm

3,4,5,6

4.0

4.0

1. In 2x2 couplers insertion loss is not specified for
launch through second input port P4 (coloured blue)

5. Connectors may be fitted to housing types 4, 5 and 6.
For connectorisation of housing type 3 please contact the sales office.

PM Coupler

The G&H PM Coupler enables the accurate monitoring and
splitting of optical signals in polarisation maintaining fibre.
Manufactured using industry-standard PM fibre, the PM Coupler is
available in any coupling ratio from 1% to 50%. Based on G&H’s fused
fibre technology, the PM Coupler demonstrates very low loss, high power
handling and there is no price penalty for adding a second input port.
The centre operating wavelength may be chosen from within a wide variety
of operating passbands, including 980, 1064, 1310, 14xx, 15xx and 16xx.

In common with all PM components, it is necessary to
launch into either the slow or the fast axis to maintain polarisation.
For the G&H PM Coupler, specifications are based on slow axis launch,
although fast axis versions are also available if requested.

Key Features:

All PM fibre construction

Low excess loss

High power handling

980, 1064, C, L and S bands available

Slow axis operation as standard

Fast axis operation also available

Applications:

Power monitoring of PM sources

Coherent communications

Fibre gyroscopes

High power fibre lasers

Fibre amplifiers

Optical Specifications1

Parameter

Specification

Unit

Centre Wavelength Range

9xx

10xx

1310

14xx

15xx

16xx

nm

Available Wavelengths2

915-999

1000-1099

1310

1425-1499

1500-1599

1600-1650

nm

Coupling Ratio

1/99

%

Coupling Ratio Tolerance

+/- 0.5

%

Extinction Ratio3, Grade A

20

20

20

20

20

20

dB

Extinction Ratio3, Grade B

17

17

17

17

17

17

dB

Coupling Ratio

5/95

%

Coupling Ratio Tolerance

+/- 1.5

%

Extinction Ratio3, Grade A

20

20

20

20

20

20

dB

Extinction Ratio3, Grade B

17

17

17

17

17

17

dB

Coupling Ratio

10/90

%

Coupling Ratio Tolerance

+/- 3.0

%

Extinction Ratio3, Grade A

20

20

20

20

20

20

dB

Extinction Ratio3, Grade B

17

17

17

17

17

17

dB

Coupling Ratio

33/67

%

Coupling Ratio Tolerance

+/- 4.0

%

Extinction Ratio3, Grade A

20

20

20

20

20

20

dB

Extinction Ratio3, Grade B

17

17

17

17

17

17

dB

Coupling Ratio

50/505

%

Coupling Ratio Tolerance

+/- 5.0

%

Extinction Ratio3, Grade A

20

20

20

20

20

20

dB

Extinction Ratio3, Grade B

17

17

17

17

17

17

dB

Excess Loss Grade A

0.3

0.3

0.3

0.3

0.3

0.3

dB

Excess Loss Grade B

0.5

0.5

0.5

0.5

0.5

0.5

dB

Return Loss/Directivity

50

dB

Pigtail Tensile Load

5

N

Operating Temperature

-5 to +751

oC

Storage Temperature

-40 to +85

oC

Fibre Type

Polarisation maintaining fibre (industry-standard
profile)

1. All specifications are for operation at room
temperature.

2. The centre wavelength may be selected from within the
available wavelength ranges supplied.

These high
performance parts are available at a range of wavelengths with different
fibre options. PM LRTs can therefore be readily specified in a wide
variety of applications, enabling rapid design cycles and new project
builds.

Standard
parts are available at wavelengths from 900 – 1600nm. For other
wavelengths or coupling ratios please contact the sales office.

Key
Features:

Low Loss

High PER

High power
handling

PM PANDA
Fibre on all ports

Applications:

Fibre
lasers

Instrumentation

Optical Specifications

Parameter

Specification3

Unit

Coupling Ratio

0.01

0.1

1

5

10

%

Tap Insertion Loss1

36 -44

27-33

18.2-23

11.9-14.9

8.86-1.85

dB

Signal Insertion Loss1

0.3(Typ<0.1)

0.3 (Typ<0.1)

0.37

0.6

0.9

dB

1300 – 1600 Signal PER2

>20

dB

900 – 1100 Signal PER2

>20

dB

Return Loss

>55

NA

Operating Wavelength4

Any Wavelength from 900-1100nm and 1300-1600nm

NA

Housing

Regular Ø3.0 x 60 (max)

Fibre Type

PM PANDA Fibre

1. Insertion Loss at operating wavelength. Not including
TDL.

2. Devices manufactured to operate in fast axis as
standard. For use in a slow-axis system a 90° PM splice is required.

3. Specifications shown are for operation at room
temperature.

4. The centre wavelength may be selected from within the
available wavelength range supplied.

The Ultra
Low Ratio Tap Coupler splits a very small amount of light from a signal
path to a tap port. Tested at up to 50W optical power, it’s main
application is in the monitoring of very high power optical sources such
as fibre lasers. Low tap ratios such as 0.1%, 0.01% or 0.001% enable the
monitoring photodetector to operate without damage or saturation.

G&H
proprietary manufacturing technology provides ultra-low loss in the
signal path, thereby maximising optical power handling. Consistently
high return loss (>55dB) reduces the amount of optical power reflected
back along the input fibre. This helps the fibre laser operate in a
stable manner.

Standard
parts are available for wavelengths from 700 to 1599nm. For other
wavelengths, coupling ratios or customised fibre types please contact
the sales office.

Key
Features:

Tap ratio
up to 40dB

High return
loss

Ultra-low
signal insertion loss

High power
handling

Available
at wide variety of laser wavelengths

Custom
product

Applications:

Fibre
Lasers

RAMAN
amplifiers

High Power
EDFA

Specifications

Parameter

Specification

Unit

Coupling Ratio

0.1

0.01

0.1

%

Tap Insertion Loss

30 (±3)

40 (±4)

50 (±5)

dB

Signal Insertion Loss
1,2

0.1

dB

Return Loss

≥ 55

dB

Operating Wavelength 3

Any selected wavelength from 700 to 1599nm

nm

Housing

Regular Æ3.0 x 50

mm

Operating Temperature

-40 to 75

oC

Storage Temperature

-40 to 85

oC

Pigtail Tensile Load

5

N

Fibre Type 4

Singlemode

1. Maximum insertion loss at operating wavelength. Not
including TDL or PDL.

2. In 2x2 couplers insertion loss is not specified for
launch through second input port P4 (coloured blue)

3. Other wavelengths available as custom components.
Please contact the sales office.